There's no reason to leave the strip. At all. Some hotels are moderately priced and you can tend to get amazing package deals on travel websites. You should be able to walk everywhere you want and go up and down the strip without getting too exhausted.

I love Vegas. It's dirty, trashy, too bright and after 7pm, everyone is belligerent. Love it. (except in the summer, too damn hot)

I'll be there in three and a half weeks to see The Postal Service at The Cosmopolitan. So excited!